[ Identification | Description | Input parameters | Links ]
Guide_anyshape ComponentThis is a reflecting object component. Its shape is defined from an OFF file, given with its file name. The object size is set as given from the file, where dimensions should be in meters. The bounding box may be re-scaled by specifying xwidth,yheight,zdepth parameters. The object may optionally be centered when using 'center=1'. The reflectivity is specified either from the usual parametric description R0,Qc,alpha,W,m, or from a reflectivity file 'reflect' with a 2 column format [q(Angs-1) R(0-1)], or per face from the geometry file (file_coatings=1). Per-face coatings (file_coatings=1, replaces the former Guide_anyshape_r): the numbers following the vertex indices of each face in the OFF/PLY file are read as m, alpha, W (IN THIS ORDER), optionally followed by R0 and Qc: nv i1 i2 ... inv m alpha W [R0 [Qc]] e.g. 4 0 5 6 4 3.0 6.07 0.003 Values that are not given in the file are taken from the component parameters. See the example file Guide_r.off. Former Guide_anyshape_r(m=0, alpha=0, W=0, ...) corresponds to Guide_anyshape(file_coatings=1, ...). The complex OFF/PLY geometry option handles any closed non-convex polyhedra, with polygons of any number of vertices. It supports the OFF, NOFF and COFF file formats (colours are ignored, but face colours would be interpreted as coatings when file_coatings=1). Such files may be generated from XYZ data using: qhull < coordinates.xyz Qx Qv Tv o > geomview.off or powercrust coordinates.xyz and viewed with geomview or java -jar jroff.jar (see below). The default size of the object depends of the OFF file data, but its bounding box may be resized using xwidth,yheight and zdepth. PLY geometry files are also supported.
| Name | Unit | Description | Default | |
| xwidth | m | Redimension the object bounding box on X axis is non-zero | 0 | |
| yheight | m | Redimension the object bounding box on Y axis is non-zero | 0 | |
| zdepth | m | Redimension the object bounding box on Z axis is non-zero | 0 | |
| center | 1 | When set to 1, the object will be centered w.r.t. the local coordinate frame | 0 | |
| transmit | 1 | When true, non reflected neutrons are transmitted through the surfaces, instead of being absorbed. No material absorption is taken into account though | 0 | |
| R0 | 1 | Low-angle reflectivity | 0.99 | |
| Qc | AA^-1 | Critical scattering vector | 0.0219 | |
| alpha | AA | Slope of reflectivity | 3 | |
| m | 1 | m-value of material. Zero means completely absorbing. | 2 | |
| W | AA^-1 | Width of supermirror cut-off | 0.003 | |
| reflect | q(AA^-1) R(0-1) | (str) Reflectivity file name. Format | 0 | |
| geometry | str | Name of the OFF/PLY file describing the guide geometry | 0 | |
| file_coatings | 1 | When 1, use m, alpha, W [R0, Qc] given per face in the geometry file instead of the parameters (which then serve as defaults for values missing in the file). | 0 |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Guide_anyshape.comp.
[ Identification | Description | Examples | Input parameters | Links ]
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